The Southwestern United States has a greater vulnerability to climate change impacts on water security due to a reliance on snowmelt driven imported water. The State of California, which is the most populous and agriculturally productive in the United States, depends on an extensive artificial water storage and conveyance system primarily for irrigated agriculture, municipal and industrial supply and hydropower generation.

A EWG analysis of federal data from nationwide drinking water tests shows that the compound contaminates water supplies for more than 200 million Americans in all 50 states.

California has experienced a dry 21st century capped by severe drought from 2012 through 2015 prompting questions about hydroclimatic sensitivity to anthropogenic climate change and implications for the future. We address these questions using a Holocene lake sediment record of hydrologic change from the Sierra Nevada Mountains coupled with marine sediment records from the Pacific. These data provide evidence of a persistent relationship between past climate warming, Pacific sea surface temperature (SST) shifts and centennial to millennial episodes of California aridity.

He's over 100 years old, but his sex life is the stuff of legend. Diego the Tortoise is quite the ladies' man, and his exploits have helped save his species from extinction.

Experts said going forward will be more challenging because the new goal, to reduce emissions 40 per cent below 1990 levels by 2030, is considerably more ambitious.

The mountain lion population in the Santa Monica Mountains, a coastal range outside of Los Angeles in Southern California, is very small, numbering just an estimated 15 individuals.

BOISE, IDAHO – Thirty-five large, uncontained wildfires are burning in the West, and firefighters are making initial attacks on another 112 new fires trying to prevent them from getting big.

Gleaming pipe sculpture could use solar power to desalinate up to 4.5 billion litres of drinking water every year

California lawmakers voted to extend the state's climate change fighting efforts out to 2030 on Wednesday, giving a new lease on life to the most ambitious greenhouse gas reduction program in the c

Dozens of wildfires raged in the arid U.S. West on Tuesday, blackening hundreds of square miles of land and forcing residents from homes in California and Washington state.